Who is the least likely to experience a problem with their sleep/wake patterns (this one takes some independent thought!)?
-Blind people, as they only are able to respond to inner factors
-Night owls, as they are most in 'synch' with the day to day environment of getting up early
-Larks, as they fall asleep too early
-Shift workers, as once one becomes accustomed to a new pattern, it becomes entrained.
Larks, as they fall asleep too early
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Sieve tubes are part of _____
a. cortex c. phloem b. mesophyll d. xylem
In an equilibrium population
A) population size cannot change. B) allele frequencies do not change. C) rates of gene flow are constant. D) natural selection occurs. E) mutation rates do not change.
Antigen exposure is necessary to
A) induce genetic hypermutation in B cells with productive antibody genes. B) stimulate B cell to differentiate to plasma cell. C) stimulate B cell to produce soluble antibodies. D) stimulate B cell differentiation, antibody production, and genetic hypermutation of antibody genes.
An illness outbreak occurs in New York City birds in the late 1990s. After a lengthy scientific investigation, the Centers for Disease Control (CDC) determine that the agent causing the birds to die is the West Nile virus
Outbreaks of this illness have been observed in several other countries in Asia and the Middle East across the last 50 years, but not in the United States. With this information, what would be the best categorization of this infectious agent/disease A. This is clearly a reemerging infection. It's been around for a long time, and it is reappearing in a susceptible population again. B. This is clearly a nosocomial infection. It's transmitted from animals to human beings in urban environments. C. This is clearly an emerging infection. It hasn't been around that long, and it has made a jump across continents into a new susceptible population. D. This is clearly not a concern to human beings--maybe it's emerging in animals, maybe it's reemerging, maybe it's nosomial. But who cares? It's only in birds.